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Old 05-06-2016, 10:14 AM   #31
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The bus is now back at the dealers to see if they can find the problem. It has officially missed its maiden voyage and we are looking for hotels now.

Thanks, everyone. It was a good effort.
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Old 05-06-2016, 11:28 AM   #32
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Out of curiosity, has your mechanic tried turning up your injector pump?
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Old 05-09-2016, 04:05 PM   #33
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I am repeating what I heard, not implying that I know what I'm talking about.

So the current story from the dealer: The tachometer is broken. It maxes out at 2000 RPM but the engine is spinning faster. The top end speed problem is a combination between the "front brake slack adjusters" (Never heard of it) and the top end limit of 68mph. They adjusted the slack and drove 15 minutes out. It performed just as they expected it to on the way out but got more and more sluggish on the way back. Apparently there is a rachetting mechanism in the slack adjusters that is not holding. When you apply the brakes, they don't disengage all the way. So the bus was working pretty hard to overcome the fact that I was effectively constantly riding the brakes.

$300 will replace both slack adjusters and that should give me normal performance except for the top speed limit at 68mph. They can't reprogram the limit but have referred me to someone who might be able to.
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Old 05-09-2016, 04:12 PM   #34
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Dragging brakes start a lot of fires on 18 wheelers. Nothing to take lightly.
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Old 05-09-2016, 04:24 PM   #35
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Originally Posted by barbar0ssa View Post
I am repeating what I heard, not implying that I know what I'm talking about.

So the current story from the dealer: The tachometer is broken. It maxes out at 2000 RPM but the engine is spinning faster. The top end speed problem is a combination between the "front brake slack adjusters" (Never heard of it) and the top end limit of 68mph. They adjusted the slack and drove 15 minutes out. It performed just as they expected it to on the way out but got more and more sluggish on the way back. Apparently there is a rachetting mechanism in the slack adjusters that is not holding. When you apply the brakes, they don't disengage all the way. So the bus was working pretty hard to overcome the fact that I was effectively constantly riding the brakes.

$300 will replace both slack adjusters and that should give me normal performance except for the top speed limit at 68mph. They can't reprogram the limit but have referred me to someone who might be able to.
68 is pretty fast. I'd be happy with that, personally.
Are your adjusters manual or auto?
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Old 05-09-2016, 05:33 PM   #36
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I have no idea if they are manual or automatic. I am kindof assuming manual, but that is just a vague guess based on the type of words they used to describe them.
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Old 05-09-2016, 07:25 PM   #37
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They're likely automatics. Because manuals wouldn't adjust tighter going down the road.

What's it tach out to in neutral? That should tell you if the tach is broken. All the bad tachs that I've seen, they either worked or didn't. Never seen one that stopped at a certain rpm.

As far as reprogramming, you might be limited by gear also. So reprogramming isn't a sure bet. Plus 68 mph is pretty fast, and as long as your engine isn't redlined at that speed, perfectly fine for a bus.
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Old 05-09-2016, 09:38 PM   #38
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Plus 68 mph is pretty fast, and as long as your engine isn't redlined at that speed, perfectly fine for a bus.
Agreed. If you're in a hurry, buy a jet. Skoolies aren't for drag racing, they're for enjoying the view.....
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Old 05-09-2016, 09:46 PM   #39
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Dragging brakes start a lot of fires on 18 wheelers. Nothing to take lightly.
And a lot more fires on Entertainer coaches!
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Old 05-10-2016, 07:30 AM   #40
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They're likely automatics. Because manuals wouldn't adjust tighter going down the road.

What's it tach out to in neutral? That should tell you if the tach is broken. All the bad tachs that I've seen, they either worked or didn't. Never seen one that stopped at a certain rpm.

As far as reprogramming, you might be limited by gear also. So reprogramming isn't a sure bet. Plus 68 mph is pretty fast, and as long as your engine isn't redlined at that speed, perfectly fine for a bus.

not necessarily.. if his dashboard was ever replaced the taachometer may have been set up for a different sending unit or different number of pulses per second.. some clusters use dip switches to set this.. others its a computer programmable item.

68 MPH is fast for a school bus.. I sure dont like the feel of them at that speed... 65 tops for me..

there are "audio tachometers" apps you can download on your phone that try to pick up the rhythm in your engine.. you can download one of these and play with it while the bus is stopped and in neutral.. gives you an idea what your tach might be doing..

-Christopher
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